Add permissions check for getNetworkType

-Add a function in TelephonyPermissions to check
 READ_PHONE_STATE or return NETWORK_TYPE_UNKNOWN (soft denial).
-Honor the subId in TM or use the default DATA sub when
 returning the network type.

Bug: 132466954
Test: cts - atest TelephonyManagerPermissionTest
Change-Id: I4e1767c9dc10acbadec286512752d4bb52059b74

telephony/java/android/telephony/TelephonyManager.java

@@ -2246,7 +2246,7 @@ public class TelephonyManager {
     @UnsupportedAppUsage
     public String getNetworkOperatorForPhone(int phoneId) {
         return getTelephonyProperty(phoneId, TelephonyProperties.PROPERTY_OPERATOR_NUMERIC, "");
-     }
+    }
 
 
     /**
@@ -2446,21 +2446,7 @@ public class TelephonyManager {
      * @return the NETWORK_TYPE_xxxx for current data connection.
      */
     public @NetworkType int getNetworkType() {
-       try {
-           ITelephony telephony = getITelephony();
-           if (telephony != null) {
-               return telephony.getNetworkType();
-            } else {
-                // This can happen when the ITelephony interface is not up yet.
-                return NETWORK_TYPE_UNKNOWN;
-            }
-        } catch(RemoteException ex) {
-            // This shouldn't happen in the normal case
-            return NETWORK_TYPE_UNKNOWN;
-        } catch (NullPointerException ex) {
-            // This could happen before phone restarts due to crashing
-            return NETWORK_TYPE_UNKNOWN;
-        }
+        return getNetworkType(getSubId(SubscriptionManager.getDefaultDataSubscriptionId()));
     }
 
     /**
@@ -2491,7 +2477,7 @@ public class TelephonyManager {
      * @hide
      */
     @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
     public int getNetworkType(int subId) {
         try {
             ITelephony telephony = getITelephony();

telephony/java/com/android/internal/telephony/ITelephony.aidl

@@ -459,13 +459,6 @@ interface ITelephony {
     // Send the special dialer code. The IPC caller must be the current default dialer.
     void sendDialerSpecialCode(String callingPackageName, String inputCode);
 
-    /**
-     * Returns the network type for data transmission
-     * Legacy call, permission-free
-     */
-    @UnsupportedAppUsage
-    int getNetworkType();
-
     /**
      * Returns the network type of a subId.
      * @param subId user preferred subId.

telephony/java/com/android/internal/telephony/TelephonyPermissions.java

@@ -102,6 +102,16 @@ public final class TelephonyPermissions {
                 callingPackage, message);
     }
 
+    /** Identical to checkCallingOrSelfReadPhoneState but never throws SecurityException */
+    public static boolean checkCallingOrSelfReadPhoneStateNoThrow(
+            Context context, int subId, String callingPackage, String message) {
+        try {
+            return checkCallingOrSelfReadPhoneState(context, subId, callingPackage, message);
+        } catch (SecurityException se) {
+            return false;
+        }
+    }
+
     /**
      * Check whether the app with the given pid/uid can read phone state.
      *